I can confirm that several rear-contact pursuits caused disruption in games I played last night. I'm certain that this is standard functionality.
I've just seached the forum to find the details of this and although I can't find the release notes that implemented this (for some reason they have been removed from the forum), I have found a couple of threads that discussed the merits of this (at the time new) functionality and potential inconsistencies.
viewtopic.php?t=24188&highlight=rear+cohesion+pursuit
viewtopic.php?t=24029
If I were to guess based on the dates of these posts then this functionality was implemented in early May 2011.
Although I don't like it then I'd prefer it if it worked consistently. It's inconsistency that is really annoying.